Enemy torpedoes slammed into the USS Indianapolis under darkness in the South Pacific, just after the U.S. Navy ship had delivered the enriched uranium and other critical components that would be used in the atomic bombs dropped on Japan.
Minnesotan Erwin Hensch, one of 1,200 or so sailors and Marines aboard, soon found himself flailing in the water among the fewer than 900 who initially survived the cruiser's sinking.
Over the next five days, hundreds more would fall victim to the relentless attack of sharks and other peril.
"I was absolutely determined to make it because I had a brand new wife at home and I'd seen her only a few times since we were married," Hensch told the Albuquerque Journal in 1969. "I didn't give up."
Hensch died Oct. 15 at a senior living facility in Crosby, Minn. The longtime Burnsville resident was 93 and had been battling complications brought on by Alzheimer's disease.
The Indianapolis met its fate on July 30, 1945, four days after arriving from San Francisco at a U.S. base on Guam's Tinian island with the secret cargo that would end World War II. The ship sank in just 12 minutes and the disaster remains the Navy's greatest single loss of life at sea.
"Shark attacks began with the coming of daylight," according to an exhaustive narrative written by Patrick J. Finneran, former executive director of the Indianapolis' Survivors Memorial Organization. "One by one sharks began to pick off the men on the outer perimeter of the clustered groups. Agonizing screams filled the air day and night. Blood mixed with the fuel oil."
"The survivors say the sharks were always there by the hundreds — swimming just below their dangling feet. It was a terror-filled ordeal — never knowing if you'd be the next victim."